Re: Logical Replication of sequences

Dilip Kumar <dilipbalaut@gmail.com>

From: Dilip Kumar <dilipbalaut@gmail.com>

To: Peter Smith <smithpb2250@gmail.com>

Cc: shveta malik <shveta.malik@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, vignesh C <vignesh21@gmail.com>, Shlok Kyal <shlok.kyal.oss@gmail.com>, Chao Li <li.evan.chao@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>, Nisha Moond <nisha.moond412@gmail.com>, Peter Eisentraut <peter@eisentraut.org>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Euler Taveira <euler@eulerto.com>, Michael Paquier <michael@paquier.xyz>, "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>, "Jonathan S. Katz" <jkatz@postgresql.org>

Date: 2025-10-09T07:22:33Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Doc: Add documentation for sequence synchronization.
- 55cefadde874 19 (unreleased) landed
Remove unused assignment in CREATE PUBLICATION grammar.
- bfb7419b0bbe 19 (unreleased) landed
Add seq_sync_error_count to subscription statistics.
- f6a4c498dcf6 19 (unreleased) landed
Fix few issues in commit 5509055d69.
- 5a4eba558aa7 19 (unreleased) landed
Add sequence synchronization for logical replication.
- 5509055d6956 19 (unreleased) landed
Add worker type argument to logical replication worker functions.
- 3e8e05596a02 19 (unreleased) landed
Introduce "REFRESH SEQUENCES" for subscriptions.
- f0b3573c3aac 19 (unreleased) landed
Refactor logical worker synchronization code into a separate file.
- 41c674d2e31e 19 (unreleased) landed
Standardize use of REFRESH PUBLICATION in code and messages.
- 2436b8c047ff 19 (unreleased) landed
Add "ALL SEQUENCES" support to publications.
- 96b378497346 19 (unreleased) landed
Expose sequence page LSN via pg_get_sequence_data.
- b93172ca59f4 19 (unreleased) landed
Resume conflict-relevant data retention automatically.
- 0d48d393d465 19 (unreleased) cited
Post-commit review fixes for 228c370868.
- 1f7e9ba3ac4e 19 (unreleased) cited
Generate GUC tables from .dat file
- 63599896545c 19 (unreleased) cited

On Thu, Oct 9, 2025 at 12:30 PM Peter Smith <smithpb2250@gmail.com> wrote:
>
> I think the "ALTER SUBSCRIPTION sub REFRESH PUBLICATION" command has
> the word PUBLICATION in it because it's the PUBLICATION has changed
> (stuff added/removed), so we need to refresh it.
>
> OTOH, the synchronisation of *existing* sequences is different - this
> is more like the subscription saying "Just get me updated values for
> the sequences I already know about". Therefore, I don't think the word
> PUBLICATION is relevant here.
>
> ~~
>
> So my suggestion is very different.  Just this:
> "ALTER SUBSCRIPTION sub REFRESH SEQUENCES"
>
> I feel this is entirely consistent, because:
>
> PUBLICATION objects have changed. Refresh me the new objects => ALTER
> SUBSCRIPTION sub REFRESH PUBLICATION;
>
> SEQUENCE values have changed. Refresh me the new values => ALTER
> SUBSCRIPTION sub REFRESH SEQUENCES;

I prefer this suggestion over the previous proposal so +1 from my side.

-- 
Regards,
Dilip Kumar
Google